Temperature switch



June 8, 1948. c SPRACHER 2,442,830

TEMPERATURE SWITCH Filed March 1, 1946 8 INSULATDR 9 z IN V EN TOR.

point of element 6.

element 6 has Patented June 8, 1948 UNITED STATES PATENT OFFICE TEMPERATURE SWITCH Clifford D. Spracher, Downey, Calif. Application March 1, 1946, Serial No. 651,331

1 Claim.

My invention relates to temperature switches for stopping internal combustion engines although it might also be used in other places.

The general object of my invention is to provide a means of stopping the engine in case anything goes wrong which causes it to over-heat.

Other objects, advantages, and features of invention may appear in the accompanying drawing, detailed description and the appended claim.

The drawing is a detailed sectional view of the temperature switch.

My switch comprises, namely, a body I, an insulator 2, formed of suitable insulating material such as ceramics, contact screw 3, lower contact piece 4, spring 5, and operating element 6.

In operation, the threaded portion l of switch is screwed into the water-jacket of engine so that end of switch containing element 6 is surrounded by the water.

In case well say the water pump Or fan belt breaks which cause engine to overheat and the temperature of said water reaches the melting The element 6 then melts and releases lower contact piece 4, so spring 5 can raise piece 4 to ground contact screw 3, which is insulated by insulator 2.

To reset switch simply remove nuts 8 and 9, then heat lower end of switch to melt element 6 and push screw 3 down (which will in turn force contact piece 4 down) and hold it down until cooled. Then replace nuts 8 and 9 and switch is ready for use again.

The lower end of contact piece 4 is flared out as shown at Ill, so that it cannot slip through element 6 until element has melted.

The lower portion of switch which surrounds element 6 has an indentation II, so that element 6 cannot slip up until it has melted.

The flared out end of piece 4 and the indentation ll of this switch are the main secrets oi. its successful operation.

2 Without those features the switch will not work successfully as it may ground screw 3 ten or twenty degrees before the melting point of element 6, due to expansion and contraction of surrounding metal of element 6 and contact piece 4 Having described only a typical, preferred form of my invention, I do not wish to limit myself to the specific details set forth, but wish to reserve to myself any changes or variations that may appear to those skilled in the art or fall Within the space of the following claim,

Having described my invention, I claim.

A temperature switch comprising a body formed as one piece, an insulator fixedly mounted in the body, a contact screw mounted in the insulator, and extending through said insulator, a contact pin, a fuseable metal in the lower part of said body said contact pin being imbedded in the fuseable material, said body being indented,

the indentation extending into the fuseable material, a disk situated in the body and a spring resting on the disk, and pressing against the contact pin whereby said pin is urged into engagement with the contact screw.

CLIFFORD D. SPRACHER.

REFERENCES CITED The following references file of this patent:

UNITED STATES PATENTS are of record in the 

